ns102-200901-ProblemSet13 - NS102 Study Problems Set 13 The...

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NS102 Study Problems Set 13 The set contains study problems and exam questions from the previous semesters on cell structure. 1. (Exam Archive) Why are cells microscopic? Answer : Because as for every increase in the unit volume, the surface area increases much less. The volume is proportional to metabolism (accumulation o waste materials) and the surface area is proportional to import of nutrients and export of waste materials. 2. (Exam Archive) A researcher would like to film the movement of chromosomes during cell division. Which type of microscope would be her best choice for this purpose? A light microscope, a transmission electron microscope, or a scanning electron microscope? State your reasoning. Answer: Light microscope because the cell must be kept alive 3. (Exam Archive) State why prokaryote cells are smaller than eukaryote cells? Answer: There are no vesicles/organelles to separate the chemical reactions/metabolism in the cell. 4. (Exam Archive) A single cellular organism belonging to the kingdom Protista is eukaryotic, but a single cellular organism belonging to the kingdom Bacteria is prokaryotic. What is the difference between these two single cellular organisms? Answer: Eukaryotes have membrane -separated nuclei and organelles, prokaryotes don’t 5. (Exam Archive) Write down 3 unique features present in a plant cell that are not present in an animal cell Answer : Central Vacuole, Cell Wall, Chloroplast 6. (Exam Archive) A macromolecule is made up of hydrophobic and hydrophilic units linked to each other by covalent bonds. We show the hydrophobic units by the letter H and the hydrophilic ones by P. An example of the HPHH segment is shown on the right. The links between the units, shown by the lines, are free to rotate in 90° angles (a) Suppose we have a chain that is made-up of repeating units of one P followed by three H units: PHHHPHHHPHHHPHHH… Sketch the three-dimensional shape that this macromolecule would take if you were to put it in water. You may draw the cylinders as rectangles. (b) If each cylindrical unit is 10 nanometers (nm) in length, what is the approximate size of the layer that forms? Answer: (a) (b) A number somewhat greater than 30 nm
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7. (Exam Archive) What are the characteristics of biological membranes according to the “fluid mosaic” model? Answer:
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ns102-200901-ProblemSet13 - NS102 Study Problems Set 13 The...

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